Action List to check for any CMY set to overprint (and possibly fix)?

ksm1701

Member
Hi guys,

Usually I would be able to find somebody else's similar problem and amend the Action List to do what I need, but in this instance I'm really struggling trying to work out how to set an action to do what I want.

Basically, we have had a customer supplied PDF that had layers upon layers of a yellow and magenta logo all set to overprint sat on top of a very faint background containing a small amount of cyan. This has had the undesirable effect of then adding a green tinge to the yellow background when printed which unfortunately wasn't spotted before the job hit press.

Here's a screenshot of the rendered plate to show the end result:
Screenshot 2022-03-23 at 08.08.43.jpg


Does anyone have any clue as to how to set up a Pitstop Action to check and warn for any CMY elements overprinting within a PDF?

Any advice or help would most gratefully appreciated.

Thanks in advance you lovely, lovely people!
 

abc

Well-known member
Bit of a weird one.
Thing is, overprinting CMYK is a bit of a special case. The only way a CMYK channel underneath shows through is if one of the separations above is 0% (OPM1), that then lets the channel underneath come through. The problem here is actually a design issue as the overprint has been deliberately set, allowing the cyan to come through.
They would have seen that if the overprint viewing settings had been correct.
 

ksm1701

Member
Bit of a weird one.
Thing is, overprinting CMYK is a bit of a special case. The only way a CMYK channel underneath shows through is if one of the separations above is 0% (OPM1), that then lets the channel underneath come through. The problem here is actually a design issue as the overprint has been deliberately set, allowing the cyan to come through.
They would have seen that if the overprint viewing settings had been correct.
Thanks for the reply Andrew.

It was a one-in-a-million problem that everyone here on the Pre-Press side of things could see was down to whoever designed the job, unfortunately though, the higher-ups wanted to find a magic bullet to spot the issue the next time it pops up (presumably after the next 999,999 jobs have passed through ;)).
 

K3NS4N

Member
I attached an action file, remember use Show Results ALWAYS
001.PNG


then you will be see this
002.PNG
 

Attachments

  • check overprint.zip
    1.3 KB · Views: 9

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